TGFBR2 but not SPP1 genotype modulates osteopontin expression in Duchenne muscular dystrophy muscle

Luisa Piva, Bruno F. Gavassini, Luca Bello, Marina Fanin, Gianni Soraru, Andrea Barp, Mario Ermani, Corrado Angelini, Eric P. Hoffman, Elena Pegoraro

Research output: Contribution to journalArticle

Abstract

A polymorphism (rs28357094) in the promoter region of the SPP1 gene coding for osteopontin (OPN) is a strong determinant of disease severity in Duchenne muscular dystrophy (DMD). The rare G allele of rs28357094 alters gene promoter function and reduces mRNA expression in transfected HeLa cells. To dissect the molecular mechanisms of increased disease severity associated with the G allele, we characterized SPP1 mRNA and protein in DMD muscle biopsies of patients with defined rs28357094 genotype. We did not find significant differences in osteopontin mRNA or protein expression between patients carrying the T (ancestral allele) or TG/GG genotypes at rs28357094. The G allele was significantly associated with reduced CD4+ and CD68+ cells on patient muscle biopsy. We also quantified transforming growth factor-β (TGFB) and TGFB receptor-2 (TGFBR2) mRNA in DMD muscle biopsies, given the ability of TGFB and TGFBR2 to activate SPP1 promoter region and their role in DMD pathogenesis. The amount of TGFB and TGFBR2 mRNA did not predict the amount of SPP1 mRNA or protein, while a polymorphism in the TGFBR2 gene (rs4522809) was found to be a strong predictor of SPP1 mRNA level. Our findings suggest that OPN mediates inflammatory changes in DMD and that TGFB signalling has a role in the complex regulation of osteopontin expression.

Original languageEnglish
Pages (from-to)251-259
Number of pages9
JournalJournal of Pathology
Volume228
Issue number2
DOIs
Publication statusPublished - Oct 2012

Keywords

  • Duchenne muscular dystrophy
  • osteopontin
  • SPP1
  • TGFB
  • TGFBR2

ASJC Scopus subject areas

  • Pathology and Forensic Medicine

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    Piva, L., Gavassini, B. F., Bello, L., Fanin, M., Soraru, G., Barp, A., Ermani, M., Angelini, C., Hoffman, E. P., & Pegoraro, E. (2012). TGFBR2 but not SPP1 genotype modulates osteopontin expression in Duchenne muscular dystrophy muscle. Journal of Pathology, 228(2), 251-259. https://doi.org/10.1002/path.4026